Transforming device



g 3 i 1932- Q F. J. FISCHER v 1,872385 TRANSFORMING DEVICE Filed Jan. 3, 1930 Patented Aug. 16, 1932 UN T D T S PATENT OFFICE- rzallnz JOSEPH museum, or nnnsnns, GERMANY, assrenon. Teena rmm xocna s'rnnzm. AKTIENGESELLSCHAFT, or nnnsnnn, ennmm;

' zrmsromlmennvicn Application filed January 8,1930, Serial 110318340, and in Germany January 3, 1929.

My invention relates to electricalapparatus and more especially to transforming devices for transforming alternating voltages into direct high voltages comprising a graded transformer energized directly or indirectly by the main supply, a plurality of condensers connected in seriesand rectifying devices inserted between said condensers and the grades of the transformer. I

It is an object of my invention to simplify apparatus of this kind and to reduce the number of rectifying devices in such apparatusr I It is another object ofmy inventionto proratus comprising a rotary contact and two pairs of stationary contacts, each pair of stationary contacts forming a rectifying device charginga condenser. I

' i0 It is a furtherob'ect of my invention to provide plates carrying thelrectifier contacts and electrically connected to intermediate potential points of the graded transformer and of the condensers connected in series so as to control the potential dropalong the transformer and the rectifying devices.

In the drawing afiixed tothis specification and forming part thereof an embodiment of myinvention is illustrated by way of example in a diagrammatical side elevation, partly in section and partlyin perspective.

The current supply 34 is connected to the primary winding 33 of the transformer bymeans of an intermediate transformer 43, the primary winding 44 of which is connected to the source of alternating voltage 34. The secondary winding 45 is connected to the primary winding 33 of the transformer 25. The transformers 43, 25 and 26 are surrounded by insulating casings 46, 47 and 48 respectively. The casings 46, 47 48 are arranged one above the other so that an insulating column is formed, 49 is a tube, preferably a metal tube, containing the connections 50, 51 which connect the windings 45 and 33. The connection is connected to the core 52 of the transformer 25. The casings 46, 47 and 48 are separated from each other by the bottoms and covers of the easings, which preferably consist of metal and vide a mechanical rectifier in suchappa form separating screens 53, 54. In the mid I dle of the'casings 46, 47, 48 andon the outside thereofmetallic rings or shells'55, 56, 57, respectively are" arranged. 58 is ametallic cover of the insulating column. The

secondary winding 29 of the transformer 25 is connected to the separating screen 53 and to the core 52 of the transformer 25, the latter being connected to the connection 19 in the manner described hereinafter. The

windings 36 and 37 are connected to the separating screen 54 connected to the connection 20 by means of the connection 42. The connection 59 which connects the other ends of the windings 36'and 37 is guided through the insulating bushing 60'provided in the screen 54. I The secondary winding 30 of the transformer 26 is connected to the core 61 of the transformer 26 and to the metallic cover 58 of the insulating column, which is connected to the rectifiers and the condensers of the device in the mannerdescribed hereinafter. .The core 61 of the transformer 26 is connected to the shell 57 17 b and 18a, 18b of the rectifiers 15,16, 17 18, respectively. 64 is a rotatable rod passing through the plates 62 and 63-and driven by means of asynchronous motor 65. 66, 67 are metallic needles supported by the rod 64 and connecting the stationary contactsof. the

rectifiers 15, 16,17, 18 at appropriate times.

connection 68 to the shell 56 and to the connection l9-connecting the condensers 11 and 12. The plate 63 is connected by means of the connection 69 to the shell 57 and to the connection 21 connecting the. condensers 13 and 14. 70,71, 72 are resistances inserted in the connections 68,42 and69 respectively.

The stationary contact 15a is connected to surrounding the casing 48 of the transformer -The plate 62 is connected by means of'the the condenser 11 by means of the connection 22. The stationary contacts 156 and 16?) are connected together and to the screen 53 by means of a connection 73 containing a resistor 74. The stationary contact 16a is connected to the stationary contact 17a and to the connection 42 by means of the connection 75. The stationary contacts 17?) and 181) are connected together and to the metallic cap 58 by means of a connection 76 containing a resistor 77, the stationary contact 180 is connected to the connection 24, leading to the ball electrode (not shown) or the like.

The operation of this device is as follows: lVhen an alternating voltage is supplied by the source at and the motor 65 is driven synchronously, the stationary contacts of the rectifiers 15, 16, 17, 18 are connected in appropriate times, so that the condensers 11, 12, 13 and let are charged each to 125 kv. by Way of example. In consequence thereof the connections 19, 20, 21 and 24: are charged to a voltage of 125 kv., 250 kv., 375 kv. and 500 kv. respectively. It will be noted that the shells 56, 57 and the screen 54: are directly connected to the connections 19, 20, 21 connecting the condensers 11, 12, 13, 14. In consequence thereof the shells 56 and 57 and the screen 54 have a potential of 125 kv., 250 kv., 375 kv. respectively and form equipotential planes in the insulating column. By this arrangement the voltage difference between approximate parts of the device does not exceed 125 kv. so that the insulation need not be designed for a voltage exceeding 125 kv.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

In the claims aflixed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modifications thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.

I claim:

1. Apparatus for transforming alternating voltages into direct voltages comprising condensers connected in series, means for connecting said condensers, a graded transformer, a mechanical rectifier inserted between said transformer and said condensers, a rotary contact in said rectifier, two pairs of stationary contacts in said rectifier, each pair arranged to charge one condenser, horizontally arranged metallic members forming equipotential planes arranged between the grades of said transformer and electrical connections between said members and said means for connecting said condensers.

2. Apparatus for transforming alternating voltages into direct voltages comprising condensers connected in series, means for connecting said condensers, a graded transformer, a mechanical rectifier inserted between said transformer and said condensers, a rotary contact in said rectifier, two pairs of stationary contacts in said rectifier, each pair arranged to charge one condenser, an insulating casing enclosing said transformer, horizontally arranged metallic members forming equipotential planes arranged between the grades of said transformer and surrounding said casing and electrical connections between said members and said means for connecting said condensers.

3. Apparatus for transforming alternating voltages into direct voltages comprising condensers connected in series, means for connecting said condensers, a. graded transformer, a mechanical rectifier inserted between said transformer and said condensers, a rotary cont-act in said rectifier, two pairs of stationary contacts in said rectifier, each pair arranged to charge one condenser, horizontally arranged metallic members forming equipotential planes arranged between the grades of said transformer, electrical connections between said members, connections between said condensers and plates inserted in one of said connections and carrying the stationary contacts of said rectifier.

4. Apparatus for transforming alternating voltages into direct voltages comprising condensers connected in series, means for connecting said condensers, a graded transformer, a plurality of mechanical rectifier-s, a rotary contact and two pairs of stationary contacts in each rectifier, horizontally arranged metallic members forming equipotential planes arranged between the grades of said transformer, iron cores in said transformer, each core being electrically con nected to a member, a plurality of metal plates, each plate being electrically connected with one of said cores and one of said condenser connections, insulators arranged on each plate, stationary contacts arranged in pairs on each insulator, each pair of contacts arranged to charge one of said condensers and an insulating shaft traversing said plates and carrying said rotary rectifier contacts.

In testimony whereof I afiix my signature.

FRANZ JOSEPH FISCHER. 

